

INDEX TO THE ILLUSTRATIONS. 



PART I. 



SECTION I. 



Fio. PAGE. 



1 Elevations of hot-house roofs, 35 



2 Difference of elevation of the sun's rays at Philadelphia and London, . . 36 



3 End section of a forcing pit, . . . 39 



4 Ground plan and elevation of forcing pit, 41 



5 End section of a stove, 42 



6 Polyprosopic forcing house, 43 



7 Cambridge pit, 43 



8 Saunders' pit, 48 



9 Curvilinear cold pit, . . . 46 



10 Dung bed with frame for forcing, 46 



1 1 Portable glass frame, 48 



12 Portable plant protector, 43 



13 Ground plan ofan extensive framing ground, 51 



14 Range of graperies at Clifton Park, 53 



15 Single-roofed grapery, 55 



16 Span-roofed house on the same scale, 55 



17 Single-roofed curvilinear grapery, 57 



18 Double-roofed house of the same plan, 57 



19 Polyprosopic grapery, 61 



20 Ground plan of do., 61 



21 Ridge and furrow roof, 65 



22 Range of small houses, 69 



23 Ornamental grapery, 71 



24 End section of green-house, 76 



25 Perspective view of span-roofed green-house, 77 



26 Range of plant-houses, 78 



27 Ornamental plant-house, 80 



SECTION II. 



28 Roof trellises, . 85 



29 Interior trellises, 86 



30 Upright trellises, 87 



31 Rooftrellises and open border planting, 87 



32 Interior ground plan of a conservatory, 95 



